import math
def quadratic(a, b, c) :
    x1 = (-b + math.sqrt(b*b - 4*a*c)) / (2*a)
    x2 = (-b - math.sqrt(b*b - 4*a*c)) / (2*a)
    return x1, x2

# print(quadratic(2, 3, 1))

def a():
    print('无参')

def a(a) :
    print('一个参数')

a()